Quadrilaterals

All sides are equal, All angles are 90°, Diagonals are equal, Opposite sides are parallel, Diagonals bisect each other at 90°

A square has all the properties listed: (1) All four sides are equal in length, (2) All four angles are 90°, (3) Both diagonals have equal length, (4) Opposite sides are parallel to each other, (5) Diagonals bisect each other perpendicularly.

True

This statement is TRUE. In any parallelogram, opposite angles are always equal. This can be proven using the properties of parallel lines and transversals. If ABCD is a parallelogram, then angle A = angle C and angle B = angle D.

36 cm²

Area of a square = side × side = side². With side length = 6 cm, Area = 6² = 6 × 6 = 36 cm². Step-by-step: Area of square = s² → Area = 6² = 36 cm².

Rectangle, Square, Parallelogram, Rhombus

Rectangle, Square, Parallelogram, and Rhombus all have diagonals that bisect each other (meet at their midpoints). A trapezium generally does not have this property unless it's an isosceles trapezium, and even then, the diagonals are only equal, not necessarily bisecting.